Rubber Gasket Materials Compared: EPDM vs Viton vs Nitrile vs Neoprene
"Rubber gasket" covers half a dozen elastomers with very different chemistries, and picking by feel is how gaskets end up swollen, hardened, or dissolved in service. The fastest way to select is by two questions: what's the media, and what's the temperature?
Quick Comparison
| Material | Temp range | Best for | Avoid |
|---|---|---|---|
| EPDM | -60 to 300°F | Water, steam, glycols, dilute acids/caustics, outdoor UV | Oils, fuels, solvents |
| Nitrile (Buna-N) | -40 to 250°F | Petroleum oils, fuels, hydraulic fluid | Ozone, ketones, strong acids |
| Viton (FKM) | -15 to 400°F | Aggressive chemicals, fuels, high temp | Hot steam, ketones, amines |
| Neoprene | -40 to 230°F | Moderate oils, refrigerants, weathering | Strong oxidizers |
| Silicone | -80 to 450°F | Extreme temps, FDA/food contact | Fuels, oils, steam |
EPDM vs Viton: The Most Common Toss-Up
If the service is water, steam, or glycol, EPDM wins — it handles hot water and steam that will destroy Viton, at a fraction of the cost. If the service involves hydrocarbons, fuels, concentrated acids, or temperatures pushing 400°F, Viton is worth every penny. The one trap: Viton in hot steam service fails early, and EPDM in oil swells within days. Neither is a universal gasket.
When Rubber Isn't Enough
Above roughly 400°F, in high pressure classes, or in mixed/unknown chemical streams, step up to PTFE, compressed fiber, or graphite-based gaskets. Elastomer sheet is a Class 125/150, low-stress solution — great where it fits, expensive where it doesn't.
Specialty Grades
Food and pharmaceutical service should specify FDA-compliant white nitrile, EPDM, or platinum-cured silicone. Outdoor and marine service favors EPDM or neoprene for ozone resistance. For abrasive slurries, a thicker 1/4" red rubber or nitrile insert gasket cushions flange faces.
Custom Rubber Gaskets, Any Shape
We cut custom rubber gaskets from EPDM, nitrile, Viton, neoprene, silicone, and cloth-inserted sheet — one-offs or production runs. Drop your dimensions or a drawing note in the quote form above, or call (979) 233-6223, and we'll price it in 1–2 business hours.